Saw-gage.



G. FRITZ.

SAW GAGE.

APPLICATION FILED MAY 21, 1912.

. l/VI/E/VTOR Geare Fr-HZ ATTORNEYS WITNESSES GEORGE FRITZ, 0F PARKFALLS, WISCONSIN.

SAW-GAGE.

Specification of Letters Patent.

Patented Dec. 24,1912.

Application filed May 21, 1912. Serial No. 698,691.

To all whom it may concern:

Be it known that I, GEORGE FRITZ, a citizen of the United States, and aresident of Park Falls, in the county of Price and State of Wisconsin,have invented a new and Improved Saw-Gage, of which the following is afull, clear, and exact description.

This invention relates to saw gages, and has for an object to provide animproved structure which will automatically indicate the bend orcurvature of a saw applied thereto.

A further object of the invention is to provide an improved gage forsaws designed to indicate on a scale the amount of curvature of the saw,the action of the gage being automatic upon placing the gage tightlyagainst the saw or other surface being gaged.

In carrying out the objects of the invention, a support is providedhaving a centrally movable member designed to be resiliently held in anouter position. Connected to this member is a pivotally mounted arm orpointer arranged to move over a graduated scale whereby when the holderor support is placed upon a surface the motion will be transmitted tothe pointer for indicating the degree of curvature of the surface towhich the gage has been applied.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a side view of an embodiment of the invention; Fig. 2 is asection through Fig. 1 on the line 22; Fig. 3 is a section through Fig.1 on the line 3-3; Fig. 4 is a section through Fig. 1 on the line 4-4;and Fig. 5 is a top plan view of a stop embodying certain features ofthe invention.

Referring to the accompanying drawings by numerals, 1 indicates asupporting plate, and 2 a grip or hand rail which is rigidly secured tothe plate 1. The plate 1 carries at its ends stops or feet 3, and 4.Arranged centrally of the plate 1 is a reciprocating foot 5 formed withan extension 6 projecting through an aperature 7 formed in the rail orhand-hold 2. The extension 6 is formed with apertures 8 and 9 foraccommodating a spring 10 and a pointer 11 respectively. At the upperend the extension 6 is formed with shoulders 12 and 13 for engaging theupper edge of the stop 14, a slot 15 being formed in the stop 14 foraccommodating the extension 6. The spring 10 is rigidly secured at 16 tothe plate 1 and tends continually to force the foot 5 downward or in adirection away from the rail 2. WVhen the gage has been placed upon theback of a saw 17, the same will move the foot 5 and extension connectedtherewith toward the rail 2 until the feet 3 and 4 engage the saw. Ifthe back of the saw 17 is perfectly straight this movement will causethe pointer 11 to come opposite zero on the scale 18. If the back of thesaw 17 is bulged the pointer 11 will move past zero to a correctposition for indicating the amount of bulge or bend. If the back of thesaw 17 is concaved the upward movement of the foot 5 will not besufficient to move the pointer 11 to zero and will consequently indicatethe amount of concavity of the back of the saw. In this way thecondition of the back of the saw may be instantly ascertained by merelyplacing the gage 'firmly against the back of the saw. In the drawingsthe bottom edge 19 of the plate 1 has been shown as beveled or inclinedupwardly from the ends toward the center. This is to permit the foot 5to move upwardly or toward the rail 2 past a line drawn from the bottomof the foot 3 to the bottom of the foot 4 so as to indicate the bulge oroutward bowing of the back of the saw 17.

The reciprocating stop 5 is arranged to be guided by a plate 20 securedto the plate 1 and by plate 14, together with the other memberssurrounding the opening 7. The plate 20 is provided with a turned upportion 21 in which the pointer 11 is pivotally mounted so that upon aback and forth movement of the stop 5 the pointer 11 will be movedpivotally.

The gage has been described particularly in respect to saws, but it willbe evident that the same may be used for gaging other surfaces and forclearly indicating the amount of curvature of any particular surface.

Having thus described my invention I claim as new and desire to secureby Letters Patent In a device of the character described, a bodyportion, a rigidly positioned stop on the end of said body portion, areciprocating stop arranged centrally of the body portion, saidreciprocating stop being formed with a pair of notches in opposite sidesthereof, a pivotally mounted finger having one end rocating stop iscaused to normally remain in one of its extreme positions.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE FRITZ.

Witnesses:

MEDA KENNEY, E. H. SEMERAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

